Silencing can no longer be considered as a designer's afterthought, and future vehicles must have efficient silencing of all noise sources as an inbuilt design parameter. This applies as much to competition as to touring engines in view of recent international ruling, yet power characteristics must not be adversely affected. This paper describes intake and exhaust silencing studies carried out at the University of Manchester on competition and touring motorcycles, in particular using annular cavity silencing units. A 4-stroke 750 cc twin, 2-stroke 380 cc single, and a 4-stroke 500 cc single cylinder Speedway machine are considered. Noise reductions are typically 12-20 dBA (intake) and 15-30 dBA (exhaust) with improved power characteristics. (Wassmann)
The design and development of intake and exhaust silencers for high performance motorcycle engines
Die Auslegung und Entwicklung von Ansaug- und Abgasschalldaempfern fuer Hochleistungsmotorradmotoren
1978
8 Seiten, 9 Bilder, 8 Quellen
Conference paper
English
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